Improvement in toothed wheels



Jorn o owEnLQ-or 'NsoNI-a, eoNNEeTroUT.

1 Leim Pamn1v0.79,957,.dated my 1,4, 186e.,

IMPROVEMENT IN 'IOOTHED WHEELS.

dgehnle 'rfemt in it tlgrise'tettnrs @tout ma :lurking part' nf 'tigestmt.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, JOHN COWELL, of Ansoni'a, in the county of NewHavermand State ot' Connecticut, havevinvente'd a new Improvelnent iinthe Construction of rIoothed Wheels; and I do hereby declare the follow4ing, when taken connection witlrthe accompanying drawings, and theletters of referencemarked thereon, te be a full, clear, and exactdescription ofthe same,and which said` drawings constitute part of thisspecification, nud represent, 'ini Y Figure 1`, a section of the rim ofn. wheel with the teeth attached.

Figure 2,51. top view of 'the same, vand in v Figure 3a sectional viewot' a niodiieation of the same,`

This intention relatcs'tonn improvement in the manner of securing teethVin gearvhfeels, that is to say, teeth constructed so as to be insertedafter the wheel is cast; and the invention consists in the arrangementdf i a. key, combined with the construction of the' tooth and mortise,so that thesaid key, driven into thenrnortise' beside the tooth, firmlysee'uresfthe tothLin the mortise. i. l

To enable others to construct my improvement, I will proceed to describethe saine us illustrated. in-the-A accompanying drawings. i i i 'Y i Aistherim o f the wheel, formed with `rriortisesi 4'through andin properrelative position for the .insertion of a tooth'into each m ort`ise.Upon one surface or s ide'of the' mortis@ 'tt-flange, a, is formed,projecting into the mortise. The teeth B arefor'uied so nsl to set intothe s 'ad mortise, andA with a recess cut in their face corre' spendingto the flange a, so thetvlien pl'aeed-inuthe mortise the recess in thetooth will set over the flange, as seen in iig, I; 4then upon theopposite side, hetween the tooth and that tace of the mortis'e, a key,CZ, is driven which holdsth'e tooth firmly upon the flange; and preventsits accidental remoti-'al or loosening; but if it isdeSired at anytimeto remove the tooth, vdrive out the key d, and the tooth may beremov'edo'rfreplaced at pleasure.

I preferito ineke aloek inthe plate by means of the flange a, yet thetooth may'beloeked; hs AseenfatvD, fig. 1, the recess thevtooth hein'gequal. to the thielinessof therirnof the wheeler -facegofthe mertise, ndlockednthereon in the same mann-er'. Thislock, however7 is n otsolstrong as the first described.

In orderto prevent'the'eccidental throwing out ofthe keys, I arrange aplate,C, vbearing pon eyery two of the keys witll'a screw, f, throughthe said plnte `into the tooth, as denoted in igsfI and ,2, whereby thewedges are held rmlyup to their'benrirrg. I i

' Ihr-tig. 3 `is shown a nrodietion-as u substitute for the flange a.The mortse isrn'ade broader4 upon the under side ofthe rim of the wheelthan upon the top, both sides corresponding. The tooth B- is also'rnadoslightly hrend-er at that end, and so that akey, d, maybe driven uponboth sides lto adjust and secure the tooth,

tlie said two keys held in position by the plate C sind screwf,.beforc'descrhed. i

Having thus fully describedimyinvention,'\vhat I claim us newl anduseful; and'deeire toseeure by'Letters Patent, i i i i 1. Thecombinationoi`a detachable.teotli'with thc-corresponding mortises in', the rim of4the wheel, when constructed withu recesslin one fece `ofthe tooth, so as'to lock on to the corresponding face ofthe mortise, and secured by thekey d, substantially as-set fortli. Y i v 2.I The combination oftheplateC and its set-screwf with the key or'keys d, so as to secure thekeys, subi stantially in the mann-er herein set forth.v 1 v f i

